Disk plow and steering mechanism therefor



May 5, 1953 w. H. SILVER ET AL DISK PLOW AND STEERING MECHANISM THEREFOR 5 Sheets-Sheet 1 Filed June 7,1947

3 l ullk llllllll llllllll Ill! 1/ I I l I I l I 1 I l l I \L 5 n Y fiz .lllilllllL r I IIJ 7 w 6 I! all IIIIIIIIJ n 511 II IL\\ 7 w 9 L ll 2 mm J I I I I I I I I I I l I I I 4 FIG. I

INVENTORS SILVE, R0 ERT E.C X

y 1953 w. H. SILVER ET AL 2,637,258

DISK PLOW AND STEERING MECHANISM THEREFOR Filed June 7, 1947 5 Sheets-Sheet 2 FIG. 2

I N VEN TORS May 5, 1953 w. H. SILVER ET AL DISK PLOW AND STEERING MECHANISM THEREFOR Filed June 7, 1947 5 Sheets-Sheet 3 M y 5, 1953 w. (H. SILVER ET AL 2,637,258

DISK PLOW AND smgamcmzcrmmsu THEREFOR Filed June 7, 1947 5 Sheets-Sheet 4 INVENTORS TER .SILVER, ROBE T E ,TTORNEYS May 5, 1953 w. H. SILVER ET AL 3 DISK PLOW AND STEERING MECHANISM THEREFOR Filed June 7, 1947 5 Sheets-Sheet 5 FIG. ll

INVENTORS WALT R H. SILVER RBERT E. n

I A TTORNE YS Patented May 5, 1953 UNITED STATES PATENT OFFICE DISK PLOW AND STEERING MECHANISM THEREFOR Walter H. Silver and Robert E. Cox, Molinc, 11., assignor's to Deere & Company,'Moline, 111., a

corporation of Illinois Application June '7, 1947, Serial No."753,1 '?4 16 Claims.

The present invention relates generally to tractor mounted implements and is more particularly concernedwith ground working tools, such as plows and. the like, of the semi-integral type.

The object and general nature of the present invention is the provision of a semi-integral implement, such as a disk plow, particularly arranged and constructed for quick and easy connection with the tractor and. for qui k and easy disconnection therefrom, in conjunction with new and improved steering means between the front steerable means of the tractor and the rear steerahl'e'whcel of the implement. More particularly, it is a feature of this invention to provide an arrangement wherein the rear steerable wheel of the implement is held against steering movenient whcn'the outfit is in operating position but type in which the implement is capable of relative free lateral swinging movement relative to the tractor and in which the rear steerable wheel of the implement iscontrolled in different lateral positions of the implement by a connection with the steerable front wheel means of the tractor, the connections bein such that the steering action imparted to the rear steerable wheel is suhstantially unaffected by changes in the lateral position of the implement relative to the tractor.

Another feature of the present invention is the provision of improved means iorraising and lowering the implement, preferahlyin the form of a hydraulic cylinrler unit acting between the implement frame and a hitch member that is hingedly connected with the implement frame and with the tractor.

These other objects and. advantages of the resent invention will be apparent to those skilled 1'. the art after a consideration of the following stalled description, taken in conjunction with he accompanying drawings, in which:

l igure 1 plan view of a sernhintegral clisl:

plow in which'the pi nciples'oi the present mien ti'o'n have been incorporated.

'of a portion of the steering linkage shown in Figure 4, corresponding generally to a view taken along the line 5-5 of Figure 4.

Figures 6 and. 'Z are fragmentary vievs illustrating the optional positions of the disk furrow opener standards.

Figures 8 and 9 areiragmentary plan and elevationalviewso'f a modified form of the present invention wherein means is provided for raising and lowering the rear encloi the frame relative to the rear furrow wheel.

Figure 10 shows a modified form of steering arm.

Figurell showsa'n ovel form of scraper mounting.

Referring now more particularly to Figures 1 and 2, the tractor is indicated in its entirety by the reference numeral 2 and includes a pair of closely spaced steerable front wheels and apair of widely spaced-rear traction wheels 53 mounted on axle shafts 4 that are carried in extensions t forming apart of the rear axle structure oi the tractor. The tractor i is provided with a power lift unit indicated in its entirety by the reference numeral it anclwhichincludes a hydraulic cylintier unit H, including a piston and piston rod 52 movable in'a cylinder ii that is connected. by hose lines It and it with a controlling valve unit it the operating handle of which indicated at El. Ihe present invention is not particularly concerned with the details per se of the power lift unit, the same'heing substantially like that shown in'U. S. Patent 2,532,552, issued December 5, 1950, to 'Jl'rsa et a1. Normally, the cylinder unit i2, i3

i'sattached to the tractor as a permanent part spindle sleeve 25, which is fixed to the beam 22 by upper and lower clamping plates 26 and 21. The rear furrow wheel 2| is mounted on a furrow wheel axle 28 the spindle section 29 of which is disposed for both turning and vertical movements in the sleeve section 25. A steering arm 3| is fixed to the upper end of the spindle 29, and the latter also carries a rotatably mounted collar 32 that is connected by an adjusting crank screw 33 with a nut member 34 carried between the rear portions of the upper and lower plate brackets 28 and 21. The lower end of the crank member 33 is screw threaded, and turning the crank 33 in one direction or the other serves to raise or lower the end of the beam 22 relative to the rear furrow wheel 2|.

The plow beam 22 carries a plurality of furrow openers 35, preferably in the form of rotatable disks 35 connected by suitable brackets 36 to the beam 22. The lateral position of the rear furrow wheel 2| may be changed by loosening the bolts clamping the plates 26 and 21 to the rear end of the beam 22, shifting them to the desired location, and then tightening the bolts for securing the rear wheel mounting firmly to the plow beam in its new location.

The plow frame means 22 is connected with the tractor I for generally lateral swinging and also for movement about generally transverse axes in a generally vertical direction. The hitch construction connecting the plow frame with the tractor will now be described.

The hitch construction is indicated in its entirety by the reference numeral 48 and comprises a generally Z-shaped draft member 4|, preferably formed of heavy bar stock with front and rear sections 42 and 43 directed generally laterally in opposite directions. A rear bracket construction 45 comprising a generally U-shaped member 48 is fixed to the intermediate portion of the beam or bar 22 and has laterally spaced forward ends 41 apertured to receive the rear section 43 of the draft member 4|. Vertical bearing plates 48 and 49 are fixed to the forward ends 41 of the bracket 46, and the plates 48 and 49 are apertured to receive the section 43 of the draft member 4|. The draft member 4| is held against lateral displacement in the bracket 45 by any suitable means, such as a pin disposed on one side of the associated apertured bracket plate 48 and i by the hub section 52 of a steering control arm 53 that is fixed to the outer end portion of the draft bar section 43. The draft member 4|, with associated parts, forms means connecting the forward end of the plow beam or frame 22 with the tractor I for generally vertical movement relative thereto.

The forward laterally turned end portion 42 of the draft member 4| is received in a pair of sleeve sections BI and 62 that are secured, as by welding, to a mounting plate 63. Swingably mounted on the forward portion 42 of the draft member 4 I, between the sleeve sections 6| and 62, is a yoke 85 that is provided with a rearwardly extending section 65a apertured at its rear end to receive a detachable pivot bolt 66 by which the yoke 65 may be connected to the rear end of the laterally swingable drawbar 61 of the tractor I. The drawbar 81 is pivotally connected, as at 68, at its forward end to the tractor and is carried in a drawbar support I0 mounted on the lower portion of the rear axle of the tractor. The yoke 65, in addition to the section 65a, also includes a central sleeve 69 (Figure 1) mounted on theforward section 42 of the hitch member 4I- and-,a pair of side plates 69a between which the tractor drawsection 43 of the drawbar.

bar 61 is adapted to be disposed. The forward edge of the mounting plate 53 is arcuately formed, as shown at H (Figure 1), and is adapted to bear against rollers or guide studs I4 carried by the tractor drawbar support it. The tractor drawbar support 18 is of conventional construction and, in general, comprises a pair of side angles 15 and upper and lower rear crossbars T8, as best shown in Figures 1 and 3. Thus, the implement 2!! is adapted to swing laterally relative to the tractor about the pivot point 63 and is also adapted to swing vertically about the transverse axes provided by the drawbar sections 42 and 43.

A cylinder-receiving bracket TI is carried by the frame bar 22, and the power lift cylinder unit I2, I3 of the tractor is connected between the rear upturned end I8 of the bracket "Ill and an arm I9 that is connected with the rear section 43 of the drawbar 4|. Preferably, the arm 79 is rockably mounted between a pair of arms 8| secured, as by welding, to the drawbar section 43, the arm 19 being engageable with a stop E22 carried by the short arms 8|, whereby when the cylinder unit I2, i3 is extended the drawbar 4| is swung upwardly in a generally clockwise direction (Figure 2), which raises the plow frame and the disks 22 upwardly into a transport position. The plow is lowered into operating position by manipulation of the valve handle Il so as to permit the cylinder unit I2, i3 to retract, thus lowering the front end of the implement frame 23. A pair of standards 86 and 81 are fixed to the sleeves GI and 62, as by welding, and are provided with bearing sections rockably supporting the shaft 38 of a steering lever member 89, the left end of the shaft 88 being supported in a sleeve section 90 that is welded to the standard 86. The steerin arm SI and the lever member 89 form a part of an adjustable steering connection between the steerable front wheel means 2 of the tractor and the imple ment rear steerable wheel 2|. An arm 9| is fixed to turn with the steerable front wheel means of the tractor and includes an upwardly directed section 92 that is connected by a link 93 with a bell crank 94 that is mounted for rocking movement on a bracket 95 fixed to the front end of the tractor. A longitudinally extending link 96, preferably formed of two relatively adjustable telescoping sections 9? and 93, is pivotally connected at its front end, as at 95, to the bell crank 94, and. at its rear end the link section 3'5 is pivotally connected to the lower end of an arm IBI that is fixed to the shaft 88. The latter carries a second arm I82, which extends generally vertically upwardly and slidably receives a swivel member I83 to which the attachment arms I04 and I 05 of a rear link I86 are pivotally connected. The rear link I86 is made up of two telescopically associated sections I01 and E83, the latter section being pivotally connected, as at :09, to the rear wheel steering arm 3|. The slidable sleeve section I33 is shiftable along the arm I82 from one position adjacent the outer end thereof downwardly into a position substantially in line with the axis defined by the shaft 88, and such shifting of the link I86 is effected by virtue of a connection with the generally vertically swingable drawbar 4i. The last mentioned connection or link-shifting means is effected by means of a link II I that is pivotally connected to a stud I I2 carried by the front link section I87, the lower end of the link I I I being pivoted to the forward end of the steering arm 53 that is fixed to the rear The arm I82 and the sleeve I83 and link I06 constitute relatively mov- 'and' the braoket member ifi. "of :a setascrewneoliar i H3 "or the iiike isfixeti ttothe opper end or theam H12 to"linnitstlne n pwarri movement-oi the slide M13, "especially when the arm i112 is in' an' angled position.

is substantially asrfoll'ows.

@able'rparts whosezrrelative position-51s iicontrolledxby movement :61 the drawn-er it I,;and "the Lilirtk l I I, which eserves as imeans 91301" I shifting fthe link I'M and 't'ne sleeve .1 03 relative to 'J'th'e 1 arm was, is conneoted with the implement franie through the steering control arm 53, the drawbamseotionm astopzin jthe form "The "supporting" braoleet '36 1 and associated parts are of particular I construction-and will-now he described. The'hra oket aiois maiietnp of upper and lower plates I Z I and 1 I22 sapertured to reeetve "aiorward'b'olt i2 3 thatvconneets thefifrontportion o'f the braeket plates"I12Iand I2'2totheheamiil. The rear portions "or the' 'braoket plates i2 2 ant] H2 are aperturecl, as at E25, to receive'a'rearholt 126. "The latter-bolt maybe disposed in selectecl pairs ofopeni'ngsi-zfi so to clispose'the hraoket -36 "in different angular positions on the beam"?! 2.

The bracket lillates I 2 l and IE2, which-are of'gen erally triangular oonstructionare "prov'idetrwith laterally outwardly (iisposedopeningsto which a *pair or vertical plates t'l ant? I28 are fixeipreierably by'wel'dingor-the likawith a spaceth'ere- "between '50' as to receive awerti-eal standard by any suitable bearing'means. standard I23 carries a lower bolt i-ll I which e. sees through slots I32 '"formed in the lower end 'of the verti'oal plates i2? anciifi'iiyano the'unper ends-of the latter platesare proviried'with a pair'of apertures i 33 to reeeive an upper bolt 534 which passes through-annpeningin"the upper end of the"disk"standard E 2% Thebolt Hitrnay-be dis posed in either the lowerpairor-the upper pair "of opening I33, the lower bolt It sliding in the slots 32 -to accommodate the necessary-change in the angular an'ci vertical position oi: the standoard I29.

In this way, the "disk standards may-beadjusteclior oii'ilferent sizes of disks and The operation of the implement-described above When the implement is in :operating position the parts "are "arranged substantialiy'asshown in Figure 2, the'lowering oi the'rear portion of the drawoar M acting 3 through thearmtii anolthe link H I to shift the front enil of the'link Iilii 'IdDWIlWBJIidlY'SO as to bring the sleeve'seotion N33 substantially in line with the axisof the shaft ilfi, therebyholtling the rear ,jiurrow wheel "22 "against turning "mo einent about its 'verticsl axis. The depth of operation is controlled byexteniiling orretracting thehy- "tiratilio onit I52, "9 it "through *suitahleooerat-ion of 'val-t'e handle fl, and "the same hydraulic unit may-heoperated toraise'tlrie impleinent'into a transport position. oer unit I2, "is is extended-substantiallytho full in this position, the cylinamount, reacting againstthe braolretl'i "to: swing the rear'end oi the drawharti upwardlyand forwardly, not only raising" the iinpleineritirame into a transport positiorflbnt also raising the slirialiie "part i533 'o'f the steering linkage :siibstantially "to the upper end of the arm IE2. During transport, the cylinder E22, t3; serves to: holdztheparts in this position, and therefore rturning :of :the tractor .JsteerabIe :front wheel :me'ans :acts' through :the linkage B5, illlfi rand associated partstt'o .steer :the .rear afurrow wheeli I F-SD as to cause-the pl'owzto follow the tractor, whether some :iorwa'rd cor .haohin sup,;anclthoth in'transport and operating positions, the "plow isiireeito :swinglaterallyrla- :tive .to the :tractor :about thetpivot point :6 8.

For holding fthe'zplow'zpartszin iIJOSlti'OlI'EWIIQIlflQ- tacked "from .the :traotor we lpI'OVidG a pair of stands sWinga-hle into tanclcout .of "supporting-and working position. The forward stand 1535 team- :prises a pair of .1 adjostahly :connectedinarts E3 to :and 538% andgis sttzinga'hiyxmountefl ontheend '52-'01" thezdrait 'meirrher' i l iThe :stancl has 'a hook section its for holding the .standroutof contact with the BI'OUJldWVhEIl working. .Thereay "stand its comprises :pair :of :adjnstahly connected 'partstanrl is swingabiy conneeted byian eyeboltiE or theililse to the rear: end of .theiframe bar "22 and in the working position is held "on the upper clamping plate Eiiroyan elongated holt It'll.

.' Figures 8 :and 9 'lShOW a tmodifiedfform ;of :the present invention wherein means is providedz'for raising :and lowering the .zrear end of .the'frame relative to the rear furrow wheel. While :no means is :shown'in'the form ofi'the invention shown in Figures l-iforraisingiand. loweringithe frame relative to therearfurrow" wheel "4 I "since vgenerally it is not necessary to raise the from end of theiframe where'only three'furrow openers are used, it'may 'bedesirable tofprovicl'e"rear.rais ing means when moreithanithreerfurrow openers are used. Referring nowto "Figures 81an'c119 it will he noted'that the oonstructi'onof the various parts is substantiallythe samerzas decribe'cliab'ove except tha't'the Iframe bar or beam 22a i longer than the beam '22rshownin Figural so :as taprovide forfour furrow opener disks 35. SA rear-1101- tion ot'the plowlbearn 21260.15 extended laterally, as at 23a, and receives upperencllower clamping "plates i i and 1 I 4'2 which :are adjustaiolysecured :tosthe rear portion of thebeam Hahybolts M3. The upper plate I It! receives .arvertioal sleeve M5, whic'hlmay be :suhstantiallyiclentieal "with the :sleeveasectionitti described above, and a.rear:f.ur row wheel l itxis journalecl onthe lower portion M1 ora rear :furrow wheel spindle ll it, which --extends' upwardly through :the "sleeve ifseotion m5 and -oarrieszan arm ISSI. Preferably-thesteering linkage Hit, described above, is extende'dso 'tas'toaocommodate the longerirame 22a5and the rear section it? thereof is pivotally connected by La pivotiseetion Iiifito the outer end of the arm .The 'reaitiseotion 53 TOf the Z-shaped 'dra-ftzmem- "her 1 t I "in'vthis form ofthe invention, provided with an upwardly and, rearwardly I extendingarm 153 which is apertured to're'eeive a pivot pin'le i by-which the forward portion-o1" tli rearwardly extending link 552i -oonneoted"to 'thetarm "I53. The rearrendofthe link"ifi'fiis-provitletl at'Iiit to tan arm iia'tthatisfixed to'a'stfib'shaft I 53. "The latter member i mounted for-rocking movement in ahearing sieeve liti carried on rear 'portion oi the upperaolamping filate MI, heingpr-efera-lily secured thereto by welding or thelilee. A second arm iii is fixer'i to the stub shaft iL B' -a-ncl is pivoted to receive thelower end or a threaded link 1'53, theupperthreaded end-of which is ailjustably connected :by a pair lock nut iii-i to swivel member 1 Hi5 carried in a' oap mem'ber Itii. The latter member is 'CUIifmEti MWWGGH" the inner-tend of 'the arm I51 and a setssorew collar 56'! 011 theiupper fend or the spindle MB.

In operation, whenever the hitch "member H is raised, in the manner described in 'connection with the form of the invention shown in Figures 1 et seq., the arm I53 swings forwardly and exerts a pull through the link I55 to swing the bell crank member I 51, I53, I62 in' a clockwise direction (Figure 9) and serves to rais the rear end of the frame relative to the rear furrow wheel I46. It

will be understood, of course, that the plow shown in Figures 1 et seq., even though three furrow openers are used, may be provided with a rear lifting linkage like the one just described.

A modified form of steering arm is shown in Figure 10. The construction is quite similar to that shown in Figure 4 except that the tractor carried steering arm 9Ia (Figure 10) is made up of two parts ill and I12, the former being fixed to turn with the front wheel means of the tractor and the other receiving the link 93, connected together for vertical adjustment by a sleeve I14 welded to the upper end I'IB of bar III and having a pair of set screws I85 for clamping the lower end of the bar I12 against the upper end of the lower bar I'lI. Thus, the steering arm 9Ia, may be adjusted to fit various sizes and/or kinds of tractors.

The improved form of scraper mounting or support, applicable to the form of the invention shown in Figures 1 et seq., but omitted from those figures for purposes of clarity, is best shown in Figure 11. A scraper bracket I8! is provided for each furrow opener 35 and includes an L-shaped bar I82 flattened at one end, as at 83, and apertured to receive the bolts that secure it to the associated bracket plate I22. The bar I82 is formed preferably of round stock and has its shank I93 of the scraper I94 therein. By loosening the set screws the scraper may be shifted inwardly or outwardly along the bar end I 84 and/or swung in a generally fore and aft direction toward or away from the associated disk 35. Also, the scraper may be turned into different positions about the generally vertical axis defined by the vertical sleeve section I9I.

While We have shown and described above the preferred structure in which the principles of the present invention have been incorporated, it is to be understood that our invention is not to be limited to the exact details shown and described above, but that, in fact, widely different means may be employed in the practice of the broader aspects of our invention.

What we claim, therefore, and desire to secure by Letters Patent is:

1. An integral implement adapted to be connected with a tractor having steerable front wheel means, comprising frame means, a rear steerable wheel supporting the rear portion of said frame means, means acting between the tractor and front portion of said frame means for raising and lowering the latter, means for steering said rear wheel from the tractor steerable front wheel means when said frame means is raised, said means including a first part swingable about an axis in response to steering movement of said front wheel means and a second part carried by said first part for movement thereon toward and away from said axis and operatively connected with said rear. wheel, and

means connected with said frame means to be moved by lowering movement of the latter for shifting said second part on said first part substantially to said axis for holding said rear wheel against steering movement when said frame means is lowered.

2. An implement as set forth in claim 1, further characterized by said raising and lowering means including a draft member pivotally connected with said frame means for generally vertical swinging movement, and pivot means connecting said draft member with the tractor for generally lateral swinging movement relative thereto.

3. An implement as defined in claim 2, further characterized by an arm fixed to said draft memher, and a hydraulic cylinder unit connected between said frame means and said arm fOr swinging said draft member to raise and lower said frame means.

4. The combination with a tractor having a rear axle structure and front steerable wheel means, of an implement having a rear steerable wheel, a draft member pivotally connected with the front portion of said implement and the rear axle structure of said tractor for movement about generally transverse axes, an adjustable steering connection between the front steering wheel means of the tractor and the rear steerable wheel of the implement, said connection including relatively movable parts shiftable one relative to the other for controlling the amount of turning of the rear steering wheel resulting from a given amount of turning of said front steering wheel means, means connecting said one shiftable part with said draft member, and means for raising and lowering the latter for raising and lowering the front end of said implement frame and shifting said steering connection.

5. A semi-integral implement adapted to be attached to a, tractor having front steering wheel means, said implement comprising frame means, means connecting the forward end of said frame means with the rear portion of the tractor for generally vertical movement relative thereto, a rear steerable wheel supporting the rear end of said frame means, a steering connection between said rear wheel and said tractor front wheel means, said steering connection including means movable into one position for transmitting motion from said tractor front wheel means to said rear steerable means and movable into another position so that no steering motion is transmitted from said front wheel means to said rear steerable wheel, and means connected with the front portion of said implement frame for shifting said movable means into said one position when said implement frame is raised.

6. A semi-integral implement adapted to be attached to a tractor having front steering wheel means, said implement comprising frame means, means connecting the forward end of said frame means with the rear portion of the tractor for generally vertical movement relative thereto, a rear steerable wheel supporting the rear end of said frame means, a lever member adapted to be mounted on the tractor for swinging movement about a generally transverse axis and including a pair of arms, a connection between one of said arms and said tractor front wheel means whereby steering movement of the latter serves to swing said lever member, a connection between said rear wheel and the other of said arms and ineluding a part shiftable along said other arm between a first position adjacent said axis to a second position adjacent the outer end of said other arm, and means connected with the front portion of said implement frame and said shiftable part for shifting the latter from one of its positions on said other arm to the other of its positions when said implement is raised or lowered relative to the tractor.

7. An implement adapted to be connected with a tractor having steerable front wheel means, comprising frame means, generally vertically shiftable hitch means connecting the implement with the tractor, a rear steerable wheel supporting the rear portion of said frame means, a connection between said tractor steerable front wheel means and said implement rear steerable for operating the latter from said tractor front wh l mean said connection including a shaft, an arm on the shaft connected with said tractor steerable front wheel means, a second arm on said shaft, alink connected at one end withsaid rear steerable wheel to steer the latter, and means shiftably connecting the other end of said link with said second arm, means for shifting said hitch means generally vertically to raise and lower the implement frame, and means connected with said hitch means and operated concomitantly therewith for shiftingsaid link relative to said second arm when the implement frame is raised and lowered.

8. An implement adapted to be attached to a tractor having front steerable wheel means, said implement comprising frame means, a rear steerable wheel supporting the rear end of said frame means,a hitch connecting the front end of said frame means with said tractor including a part connected with the tractor in laterally swingable relation and a member connecting the rear portion of said part with the forward portion of said implement and hingedly connected with said implement and said part for generally vertical movement relative thereto about transverse axes, a shaft carried by said hitch adjacent one of said transverse axes, a pair of arms on said shaft, 3, first link means connecting the front steering wheel means of the tractor with one of said arms, and a second link means connecting the other of said arms with said implement rear steerable wheel, said shaft being shiftable generally laterally withsaid hitch relative to the tractor whereby lateral movement of the implement relative to the tractor causes only a slight variation in the effective length of the steering connection between the tractor front steering wheel means and the rear steerable wheel of the implement and the disposition of said shaft adjacent said one transverse axis providing for vertical swinging of the implement relative to the tractor without adversely affecting the steering connection between the tractor front steering wheel means and the implement rear steerable wheel.

9. The invention set forth in claim 8, further characterized by means for raising and lowering said vertically swingable hitch member, said lastmentioned link being shiftable at its forward end along the associated arm, and a connection between said last mentioned link and said vertically swingable hitch member for shifting said link along said arm when said hitch member is shifted generally vertically by said raising and lowering means.

10. A semi-integral implement adapted to be mounted on a tractor having front steerable wheel means, said implement comprising frame means, a draft member hingedly connected at its rear portion to said frame means, a laterally swingable hitch-partconneoted with the rarportion of :the tractor for generally lateral swinging movement and hingedly receiving the front portion of said draft member, a rear furrow wheel carried at therear end of said frame and turna ble about a generally vertical axis, a steering arm connected with said wheel for steering the same, asteering link connected with said steering arm, a transversely arranged shaft carried byysaidlaterally swingable hitch part and carrying arm means, means ,slidably connecting the forward end .of said steering link with vsaid arm means, means acting between said implement andsaid hingedly connected draft member for raising and lowering said implement frame, and a connection betweensaid draft member and said. vertically shiftable steering link for raising or lowering the latter along-said arm means, and a forwardly extending steering link connectingsaid arm means with the tractor front steerable wheel means.

ll. A semi-dntegral implement adapted to be mounted on a tractor having front steerable wheelmeans, said implement comprising a generally longitudinally extending beam, a draft member hingedly connected at its rear portion to said beamand at its forward portion to the tractor, an arm on said draft member, meansacting between said implementbeam and said arm for swinging said draft member generally vertically to raise the lower vsaid beam; 2. rear steerable wheel supporting the rear end of said beam, a steering connection between said wheel-andsaid tractor including .a part 'shiftable between one position, in which ,said steering connection is effective to steer said rearsteerable wheel, and another position in which said steering connection is ineffective, and means connecting the shiftaole part of saidisteering connection with said draft member whereby generally vertically swinging movement of said latter member serves to s'nli'tsaid shii'table part from one of its positions to the other.

12. Anintcgralimplement adapted to be connected with a tractor having a steerable front wheel means, comprising frame means, a rear steerable wheel supporting the rear portion of said frame means, means acting between the frame means and the tractor for raising and lowering said frame means into and out of transport and working positions, a steering connection associated with said tractor steerable front wheel means and including an arm swingably mounted on the tractor and movable in a generally fore and aft direction about a transverse axis, and a connection between said arm and said rear steerable wheel including a part shiitable on said arm from a point closely adjacent the axis of swinging thereof to a point ad acent the outer end of said arm, and means connected between said shiftable part and the implement frame means for shifting said part from the outer end of said arm to a point adjacent said axis when said implement is lowered into working position, so as to hold said rear wheel against steering, and for shifting said part from a position adjacent said axis to the outer portion of said arm when said implement is raised so as to provide for steering of said rear wheel by the movement of said tractor steerable front wheel means when said implement is raised into its transport position. :5

13. In a towed implement adapted to be connected with a tractor having steerable front wheel means and in which the implement is provided with a. rear steerable wheel, the combination of means for raising and lowering said implement, a connection between said rear steerable wheel and said steerable front wheel means and including means movable from one position in which steering motion is transmitted from said steerable front wheel means to said rear steerable Wheel to another position in which said rear wheel is held against steering movement when said steerable front wheel means is actuated, and means comiected with said raising and lowering means and with said movable means so as to be actuated by said raising and lowering means for shifting said movable means from one position to another.

14. In a towed plow or other ground working implement adapted to be connected with a tractor having steerable front wheel means and in which the implement is provided with a rear steerable wheel, the combination of means for raising and lowering said implement out of and into ground working position, a connection between said rear steerable wheel and said steerable front wheel means and including means movable from one position in which steering motion is transmitted from said steerable front wheel means to said rear steerable wheel to another position in which said rear wheel is held against steering movement when said steerable front wheel means is actuated, and means con-' nected with said raising and lowering means and with said movable means so as to be actuated by said raising and lowering means for shifting said movable means into said one position when said implement is raised out of its ground working position so as to provide for steering the rear wheel of the implement by the steerable front wheel means of the tractor during transport.

15. A semi-integral implement adapted to be attached to a tractor having front steering wheel means, said implement comprising frame means, generally laterally swingable hitch means connecting the forward end of said frame means with the rear portion of the tractor, a steering connection'b'etween said rear wheel and said tractor front wheel means, said steering connection including a shaft supported on and shiftable generally laterally with said hitch means, arms on said shaft, and links extending from said arms to said tractor steerable front wheel means and said implement rear steerable wheel.

16. An integral implement adapted to be connected with a tractor having steerable front wheel means, comprising frame means, a rear steerable wheel, means connecting the latter with the rear portion of said frame means for both steering movement and movement vertically relative to said frame means, means acting between the tractor and. the front portion of said frame means for raising and lowering the front portion of the latter, means for steering said rear wheel from the tractor steerable front wheel means when said frame means is raised, means connected with said raising and lowering means and said rear wheel for holding said rear wheel against steering movement when the front portion of said frame means is lowered, and means connected with said raising and lowering means and acting against said rear steerable wheel for raising and lowering the rear portion of said frame relative thereto whenever the front portion of said frame is raised and lowered by said raising and lowering means.

WALTER H. SILVER. ROBERT E. COX.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,637,811 Ferguson Aug. 2, 1927 1,702,615 Paul Feb. 19, 1929 1,837,3 i7 Vandine Dec. 22, 1931 1,952,486 Beall Mar. 27, 1934 2,209,029 Kriegbaum et al. July 23, 1940 2,410,918 Acton Nov. 12, 1946 2,416,194 Miller Feb. 18, 1947 

